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47 lines
1.8 KiB
Markdown
47 lines
1.8 KiB
Markdown
# How To Extend snmpd with custom script/data
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Some SNMP servers can be extended with custom scripts or programs. The output of the running script can then
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be read using the OID and can therefore be easily used in Cacti. An example is the thermometer on the USB port.
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In combination with [Graph a Single SNMP OID](Graph-a-Single-SNMP-OID.md), this is a very simple way to display such data
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We will show the procedure for the very extensive Net-SNMP and FreeBSD BSNMPD.
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## Linux Net-SNMP
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Simply add a line to /etc/snmpd.conf and restart snmpd
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**> extend test /bin/echo hello**
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Result will be here:
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**> snmpwalk -v2c -c testing 127.0.0.1 nsExtendOutput1**
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``
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NET-SNMP-EXTEND-MIB::nsExtendOutput1Line."test" = STRING: hello
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NET-SNMP-EXTEND-MIB::nsExtendOutputFull."test" = STRING: hello
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NET-SNMP-EXTEND-MIB::nsExtendOutNumLines."test" = INTEGER: 1
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NET-SNMP-EXTEND-MIB::nsExtendResult."test" = INTEGER: 0``
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For Cacti you need numeric OID, you can use snmptranslate:
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**> snmptranslate -On NET-SNMP-EXTEND-MIB::nsExtendOutput1Line.\"test\"**
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The result is an OID that we can use:
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``.1.3.6.1.4.1.8072.1.3.2.3.1.1.4.116.101.115.116``
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## FreeBSD BNSMPD
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You need install bsnmp-ucd
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**> pkg install bsnmp-ucd**
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Add these lines to /etc/snmpd.config and restart bsnmpd
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begemotSnmpdModulePath."ucd" = "/usr/local/lib/snmp_ucd.so"
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%ucd
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extNames.0 = "first command"
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extCommand.0 = "/path/to/script.sh"
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extNames.1 = "second command"
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extCommand.1 = "/path/to/script.sh param1"
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Name and result of first command have the same intex:
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**> snmpwalk -v2c -c testing 127.0.0.1 .1.3.6.1.4.1.2021.8.1.2.0**
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``.1.3.6.1.4.1.2021.8.1.2.0 = STRING: first command``
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**> snmpwalk -v2c -c testing 127.0.0.1 .1.3.6.1.4.1.2021.8.1.101.0**
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``.1.3.6.1.4.1.2021.8.1.101.0 = STRING: 15``
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